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Title

Biotic affinities in a transitional zone between the Mediterranean and the Atlantic: a biogeographical approach based on sponges.

AuthorsMaldonado, Manuel ; Uriz, María Jesús
KeywordsDemosponge biogeography
Paleomediterranean fauna
Alboran Sea
Atlantic-Mediterranean region
Biogeographical parsimony analysis
Demosponge bathymetric distribution
Fauna Paleomediterranea
Region atlanto-mediterranea
Mar de Alboran
Analisis de parsimonia biogeografico
Biogeografia de demosponjas
Distribucion batimetrica de demosponjas
Issue Date1995
PublisherBlackwell Publishing
CitationJournal of Biogeography 22 : 89-110 (1995)
Abstract[EN]This study characterizes the demosponge assem- blages established on the continental shelf of Alboran Island, a site where the faunistic influences of three biogeographical regions overlap (i.e. Mauritanian, Lusitanian and western Mediterranean regions). The patterns of species composition and abundance of Alboranian fauna are compared with those of five other Atlantic-Mediterranean islands. This comparison provides a general idea about the faunistic affinities of the Alboranian assemblages, as well as an estimate of the general faunistic heterogeneity in the biogeographical province. An important biogeographical regionalism was found in both the quality and quantity of the demosponges. The general pattern of biotic affinity is determined predominantly by horizontal distances (geographical distances) and marine cur- rents. The role of vertical distance (bathymetry) was much less significant. However, it is an important determinant for Albo- ranian assemblages. The infralittoral assemblages of this is- land are strongly affected by Lusitanian fauna. Circalittoral assemblages, however, harbour fauna with a peculiar species composition, lacking affinities with all other communities considered in this study. This fact suggests strongly that the circalittoral level of the Alboranian shelf is an ecotone estab- lished in the boundary layer between the Atlantic and Mediter- ranean water masses. The pattern of present-day biotic affinities among all the archipelagos was also used to test, by parsimony analysis, various hypotheses on the historical origin of the Mediter- ranean benthos. Results suggest that sublittoral Mediterranean fauna have a major Lusitanian-Mauritanian origin, although a few Tethyan or Paleomediterranean elements still persist in some circalittoral communities of the Alboranian shelf.
[EN]Este estudio es una caracterizacion de las pobla- ciones de demosponjas establecidas en la plataforma continen- tal de la isla de Alboran, un enclave localizado en una zona donde se solapan las influencias faunisticas de tres regiones biogeograficas (region Mauritanica, Lusitainica y Mediterraneo Occidental). La composici6n y abundancia de especie de la fauna alboraniense se han comparado con las de otros cinco archipielagos atlanto-mediterraneos para obtener una idea general de las afinidades faunisticas de Alboran, asi como una estima de la heterogeneidad faunistica de la provincia bio- geogranfica. Hay un regionalismo biogeografico importante tanto en la calidad como en la cantidad de la fauna de demosponjas. El patron general de afinidades bioticas esta determinado princi- palmente por las distancias horizontales (distancias geo- graficas) y las corrientes marinas. El papel de las distancias verticales (batimetria) es mucho menos significativo. Sin em- bargo, es un determinante importante en el caso de los asentamientos bentonicos de la plataforma de Alboran. Las comunidades del nivel infralitoral de esta isla estan fuerte mente influenciadas por la fauna lusitainica. Los asentamientos circalitorales, sin embargo, albergan una fauna con una par- ticular composici6n especifica, que carece de afinidad con cualquiera de las restantes comunidades consideradas en este estudio. Este hecho sugiere que el nivel circalitoral de la plata- forma de Alboran es un ecotono establecido en la interfacie que separa las masas de aguas noratlantica y mediterrainea. El patron actual de afinidades bioticas entre los archip- ielagos se ha utilizado tambien para testar, mediante analisis de parsimonia, varias hipotesis sobre el origen del bentos mediterraineo. Los resultados sugieren que la fauna mediter- ranea sublitoral tiene un origen mayoritariamente Lusitano- Maurita'nico, aunque algunos elementos del Tethys o del Paleomediterraneo todavia persisten en comunidades circali- torales de Albora
Description30 páginas, 9 figuras, 3 tablas, 1 apéndice.
Publisher version (URL)http://www.jstor.org/stable/2846075
URIhttp://hdl.handle.net/10261/43020
ISSN0305-0270
E-ISSN1365-2699
Appears in Collections:(CEAB) Artículos
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